$body = [
"calendario" => [
"expiracao" => 3600
],
"devedor" => [
"cpf" => preg_replace('/[^0-9]/is', '', $USER->profile['cpf']),
"nome" => fullname($USER)
],
"valor" => [
"original" => "0.01"
],
"chave" => "" // faça um chamado com CHAVE vazia
];
$pix = $api->pixCreateImmediateCharge([], $body);